Carbureter.



A. C. STEWART.

CARBUEETER.

APPLICATION TILED NOV. 25, 1907.

924,206u Patented June 8, 1909.

ALFRED o. s'rnwaa'n-or Los ANGELES,.OALIFORNLA.

CABB URETER.

' Specification of Letters Patent.

Patented June 8, 1909..

An object of this invention is to provide a carbureter wherein the air supply and the oil supply will be properly proportioned at all times in the operation of the engine, variations in speed.

Another object of vide forflushing orsupp during the invention is to pro engine.

In the accompanying drawing :Figure l is a vertical section of the carburetor. Fig.- 2 is a section on line :vx invFig. 1. Fig. 3 is a side'elevation. Fig. 4.is a detail elevation of a mixing chamber ring. Fig. 5 is a side elevation of the air chamber member.

The carbureter comprises a body 1 formed interiorly with an oil chamber 2 and the oil inlet 3 opening into thebottom thereofand provided with a valve 4-, which is raised to closed position bya spring 5. Said valve has a stem 6, extendin up into the chamber 2, and a float 7 in said c amber has a depending tube 8 Whose lower end engages said stem to depress and open the valve when the oil level lowers.

A member 10, constituting an air chamber member,.1s adapted toseat in and on the body 1, said memberlO having an upper ring portion 11, and a lower disk portion 12, connected by posts 13.. Ring portion 11 has an annular flange 14 fitting within the upper end of body. 1 and disk 12 has an annular flange I5 seating on an annular flange 16 on the body '1. Disk 12 closes the top of oil chamber 2,'the space 20 above this disk constituting an air chamber which coinmirnicates through the spaces between the posts 13, with the space within body 1. around the member 10. This latter space is in communication-with theouter air" through air inlets 17 in the Wall of body 1. Disk 12 has a central tube 18 formed thereon and extending downwardly upwardly into the air chamber 20. The tu be '18 senvesas a guide for the float 7, the tube 8 of said float sliding on tube 18, and the bottom of tube 8 being perforated at 1 9 to permit passage of oil or asolene. At the top of ring portion 11, mem e1'- 10 has an annular groove and lying an excess of. gasolene, when desired, in startingup the int-o oil chamber 2 and Application filed November'26,-1907. Sei'ia1No 403,812.

' 22, the inner wall 23 of which is lower than, the outer wall and forms a lip over which the oil flows, said groove communicating with the oil supply through -a duct 24 extending throughone of the posts into the oil in chamber 2.

A ring 27 is seated on top wall of the mixture annular flange 29, the lower end of said ring extending down into groove 22, leaving sufficient space below and inside of flange 29, to permit efliux of the oil or gasolene. A shoulder30 on ring 27, within} this flange 29, extends over the annular lip 23, so that an annular discharge slot is parts 30,23 thisslot forming an oil outlet dischargin on to the top of ii 23. The bottom of annu ar flange 29 is inc ined, as shown at 32, "so that by turnin ring- 27 to different angular posit-ions the e th of the space between the opening'of'oil uct 24 and the bottom of said flan ge is varied to varythe oilsupply, this adjustment being made in setting'up the carburetor for use. Ring 27 flares upwardly from its lower portion and the inner at 31. Said ring 27 constitutes a mixing chamber.-

tube 36 of-the engine, and

this outlet, 'confixed 39. A cam 40 to closed position, by asprmg to depress the opegated by lever 41 serves A screw 42 on this lever enbe required.

limit the opening surface of said ring is corrugated as shown A top member 33 is seated over ring 27 and 34 screwing into outlet opening 35 for connec on the top member, and pressed upwardly,-

valve to open the outlet to the engine as may to permit slow passage, of oil- 17, and through an extension 25 thereof which extends down of the member i 10 by a flange 28 thereof, said ring forming a chamber andhaving an formed between the p,

therethrough, thereby regulating the motion of the stem 44 in said tube, the latter acting as a dash pot. Above cone 43 this valve member'has-a' shoulder 46 to seat on the lip, 23 and acting as a cut oil for the air, and:

above this shoulder the cone .47 which extends within the flaring ring 27. W'hen'the valve member is fully depressed, so that shoulder 46 thereof rests on valve seat or lip 23, the upper cone '47 is close to the ribs 31 on the flaring ring, but not in actual contact therewith.

' The operation is as follows :Valve 37 having been opened, and the engine being started in operation, the suction ofthe engine "creates a condition of partial vacuum in the chamber 50 above the valve member 43, 47. Under ordinary conditions thesuction will'be sufficient to lift said valve member and to draw oil or gasolene through duct 24 and channel 22, the oil passing out at the annular slot between annular members 23, 30, and then meeting the current of air passing 'up over lip 23 and past cone 47. The valve member 43, 47 does not constrict the oil supply, the oil being free to flow out of the discharge slot in res onse to the suction thereat. The. upwar motion of the valve first unseat-s the shoulder 46 from lip 23 and opens up an annular passage between the cone 43 and the lip 23, and then on further movement of the valve, this annular passage is'increased in area so that the air supply increases, on increased suction, due to higher speed of the engine. At the same time the space between the deflecting cone 47 and the ring 27 is increased in correspond ence with the amount of suction and with the air supply, so that a fairly uniform velocity of the air through this space is secured and efticient mixture and absorption of the oil by the air is secured under all conditions of suction, even when the engine is running slow.

when the carburcter does not freely gencrate vapor, as in case of cold weather, the engine may not start up when turned. over in the usual manner. Under such conditions, the operator will turn the engineovcr slowly so that the suction is insutlicient to lift the valve 43, 47, but draws the gasolene from the oil chamber through the outlet above lip- 23, so that the carburetor is flushed with gasolene, and then on turning the engine over more rapidly, a rich mixture is furnished, enabling the engine to start up.

The movement of the valve is controlled by the dash pot so that the effectol inertia of the said valve is minimized, and the valve moves smoothly and accurately to proper position, without danger of moving too far y reason of its mementu' To insure accurate operation of this dash pot, the gasolene is allowed access thereto, through the openings in tubes 8,. 18. The float in'the Oll chamber maintains the gasolcne at a uni-- form level, so that the rate of oil supply is in definite relation to the condition of suction at the oil outlet.

What I claim is:

1. A carbu'reter comprising an air chamber formed with an annular lip, oil su ply means having an annular oil outlet a ove and discharging on to said. lip,-a' mixture chamberabove said oil outlet, means for-applying suction to the mixture chamber, and a valve member movable vertically within said chambers and having two spectively approaching the lip be 0w the outlet and the wall of the mixture chamber above the outlet, in the descent of the valve member, to restrict the passage-for air past the lip and the passage for air past and above the oil outlet, in correspondence, and said valve member formed with a shoulder lip. I t

2. A carbureter comprisinganzair chamber formed with an annular lipg'oilsupply 'means having in annular oil outlet above and discharging on to said lip, a mixture chamber above said oil outlet, means for ap,'

plying suction to the mixture chamber, and a valve member movable verticallywithin said chambers and having two u )wardly flaring portions respectively apqro ac ing the lip below the outlet and the we 1 of the mixture chamber above the outlet, in the dc: scent of the valve member, to restrict the passage for air past the lip and past andabove theioil outlet, in correspondence, said between its said two'- portions, to seat on said ortions revalve member having a shoulder between said two flaring portions, to seat on the lip when'the valvc mcmber is fully depressed,

and when the passage between the-valve member and the wall of the mixture cham- 4 ber is still open. v

3. A carbureter comprising an'air chamber formed with an annular hp, with an annular channel surrounding said lip, and with' an oil duct communicating with said channel,

an oil chamber communicating with said duct, a mixture chamber above the air chamber and movable to dlil'erent angular 'positions relatively to the air chamber, means for securing the mixture chamber in any of such positions, said mixture chamber having its wall formed as a ring with a flange extending down into said channel and having its bottom inclined, to vary the llow from the. oil duct according to the angular position of the said ring, and a vertically movable valve member cooperating with said lip to control the air admission.

4. A carlmn-lwr comprisin a body formed with an oil rbzunbor, a member seating on said body-and closing the top of said oil 0ll2LI1IbO1',i-l10 upper portion of said member forming an air chamber and provided with an annular lip around the air chamber, with a channel around the lip and with. a duct extending down from said channel, into the oil chamber, a ring seated on the air chamber member and having a portion extending over' said lip to form an annular oil outlet, a top member seated on said ring and forming therewith a mixture chamber, and formed with means for applying suction to the mixture chamber, means holdin" the top member to,

ward the body to hol t e parts in position, and a vertically movable valve member 00- operating with said lip to control the air admission.

5. A carbureter comprising an oil chamher, an air chamber above the oil chamber, and formed with a lip, Ia mixture chamber above the air chamber, oil supply means communicating with the oil chamber and having an annular outlet above and discharging onto the said lip, a valve member movable vertically in said chambers, having portions cooperating with the said ii to vary day of November 1907.

ALFRED O. STEWART. In presence of 4 ARTHUR .P. .KNIGHT, FRANK L. A. GRAHAM. 

